On 17/06/2018 18:20, Bald Eagle wrote:
> Before Alain castigates you:

LOL :-)

I replicated the conditions with two elongated boxes that intersected at 
90° to each other.
I did notice what looked like a coincidence surface problem. And when I 
turned the union into a merge. It looked like a difference with the 
intersection black. (I was using red and green emissive media to give 
yellow at the intersection.)

-- 

Regards
     Stephen

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